.main {
  margin: 0 200px;
  height: 2909px;
  overflow: hidden;
}
.main .content {
  width: 400px;
  height: 200px;
  margin-left: 400px;
  border-radius: 30px;
  margin-top: 10px;
  text-align: center;
  line-height: 200px;
  background-color: burlywood;
  color: #fff;
  font-size: 30px;
}
.main .common {
  width: 400px;
  height: 200px;
  margin-left: -1600px;
  border-radius: 30px;
  margin-top: 10px;
  text-align: center;
  line-height: 200px;
  background-color: red;
  color: #fff;
  font-size: 30px;
  transition: all 0.8s linear;
}
.main .left {
  display: block;
  margin-left: 400px;
}
.main .right {
  margin-left: 2800px;
}
.main .rightactive {
  display: block;
  margin-left: 400px;
}
body {
  background-color: papayawhip;
}
